Malicious PDF — malware analysis report

Static analysis result for SHA-256 553d324d14376482…

MALICIOUS

PDF

74.9 KB Created: 2021-02-24 20:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2f1a8537041d34deb321db5c48f3960d SHA-1: add764a1b7316c63a2fcd1686cce2ec6884fa5f8 SHA-256: 553d324d143764824eb6bca55c162a9494f7148a8dd7adad5d8ac3a6c3b5c431
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/wix?keyword=3.2+conceptos+e+importancia+de+la+calidad PDF link annotation
    • https://dananiruw.weebly.com/uploads/1/3/2/7/132741593/tipugamosava-madovepalewade.pdfIn PDF document text
    • https://tudiputowol.weebly.com/uploads/1/3/1/4/131452732/afae0ecc.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/cCjc6jc/weed_killer_safe_for_grass_and_plants.pdfIn PDF document text
    • https://mixunolonuwoja.weebly.com/uploads/1/3/0/9/130969204/7939946.pdfIn PDF document text
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/1936931.pdfIn PDF document text
    • https://dopozagipixa.weebly.com/uploads/1/3/2/7/132741545/f17dba614e14e.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/icUucij/19428824341.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/zilaguvix-tivenuf-mosuvegebenu.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/haZBijY/jikaxudulusopekejuvum.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/0fed74.pdfIn PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/43c3c.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/favigupa.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/nixowenavisa.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/e5694795c0f2939.pdfIn PDF document text
    • https://divevuke.weebly.com/uploads/1/3/3/9/133999966/1d383dda36.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/2bbee9a5efa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/what_is_the_best_food_saver_vacuum_sealer_to_buy.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE682 5452 bytes
SHA-256: 5087b694869baf807d011a0198b41a6139ae2225c67a832322416f96e2513739
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10956 bytes
SHA-256: 73213424426c2c3af1954e481e4031d46135b3a580d9ee7187f8ad99be53cb69

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